Pulitzer Prize-winning author Nelle Harper Lee, best known for her book “To Kill A Mockingbird,” died early Friday. She was 89. Few details have been released at this time, including the cause of death.

News of Lee's death broke just after 9 a.m. EST. AL.com was the first to report it, saying multiple sources in her hometown of Monroeville had confirmed the news. Several celebrities and fellow authors have since taken to social media to express their sadness regarding Lee's death, as well as celebrate her legacy.

John Green, author of “Looking For Alaska” and “The Fault In Our Stars,” tweeted about a meaningful encounter he had with Lee. Green revealed to his 4.97 million followers Lee signed a copy of one of his books after the birth of his son. He wrote while she was extremely private about her life, she was “extraordinarily generous.” “50 Shades of Grey” writer E. L. James also took a moment to honor Lee on Twitter, along with several other authors.

It’s not just members of the literary world who will miss Lee. Celebrities of all walks of life — whether they be chefs, actors, directors or TV anchors — celebrated the “Go Set A Watchmen” writer by sending condolences, quoting her books and more. Ava DuVernay, director of 2014’s “Selma,” posted a photo from the film adaptation of Lee’s “To Kill A Mockingbird” and thanked her for her contributions. Katie Couric, Joe Scarborough, Neil Perry and more also tweeted loving messages in the wake of Lee’s death.

Ernest Williams of Johnson’s Funeral Home in Monroeville confirmed Lee’s death to International Business Times but said Johnson’s would not be handling the author’s funeral arrangements. Her publisher, HarperCollins, broke the news of her death to the New York Times and CNN.